有 4 个不同的实验室制作同一型号的纸张 , 为比较各实验室生产纸张的光滑度 , 测量了每个实验室生产的 8 种张纸 , 得其光滑度如表 所示 . 假设上述数据服从方差分析模型 . 试在显著性水平α = 0.05 下 , 检验各个实验室生产的纸张的光滑度是否有显著差异 . X<-c(38.7,41.5,43.8,44.5,45.5,46.0,47.7,58.0, 39.2,39.3,39.7,41.4,41.8,42.9,43.3,45.8, 34.0,35.0,39.0,40.0,43.0,43.0,44.0,45.0, 34.0,34.8,34.8,35.4,37.2,37.8,41.2,42.8)